Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			$ 114
Additions (reductions) from provision for credit loss expense	$ 17	$ 3	17	$ 7
Balance as of end-of-period	132		132
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			86
Balance as of end-of-period	92		92
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			28
Balance as of end-of-period	40		40
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	115	103	114	98
Additions (reductions) from provision for credit loss expense	17	1	18	6
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-period	132	104	132	104
Credit loss (expense) reversal	1	(2)	1	(1)
Accrued investment income excluded from credit losses	80	53	80	53
Mortgage loans on real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	84	83	86	83
Additions (reductions) from provision for credit loss expense	8	(2)	6	(2)
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-period	92	81	92	81
Mortgage loans on real estate | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	31	20	28	15
Additions (reductions) from provision for credit loss expense	9	3	12	8
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-period	$ 40	$ 23	$ 40	$ 23